135621773 has 4 divisors (see below), whose sum is σ = 154996320. Its totient is φ = 116247228.

The previous prime is 135621763. The next prime is 135621779. The reversal of 135621773 is 377126531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 135621773 - 2⁴ = 135621757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135621779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9687263 + ... + 9687276.

It is an arithmetic number, because the mean of its divisors is an integer number (38749080).

Almost surely, 2^135621773 is an apocalyptic number.

It is an amenable number.

135621773 is a deficient number, since it is larger than the sum of its proper divisors (19374547).

135621773 is an equidigital number, since it uses as much as digits as its factorization.

135621773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19374546.

The product of its digits is 26460, while the sum is 35.

The square root of 135621773 is about 11645.6761504002. The cubic root of 135621773 is about 513.7791460348.

The spelling of 135621773 in words is "one hundred thirty-five million, six hundred twenty-one thousand, seven hundred seventy-three".